Thought I did upvote. Fixed.

But I don't see any mention of a USD peg in anything you quoted. It's still relatively stable as it's worth about $1 of Steem right now. A little more.

The only time it became unstable was when it jumped before the Steem price increased.

I really have no idea where the assumption of a USD peg comes from other than the fact it has a dollar sign in front of it. There is no mention of the USD anywhere.